Spring relocation without mini tub?

Well I'm sure you can make that work.
But mini-tubbing and spring into-the-frame is a huge amount of work, just to avoid narrowing the rear.
After doing all that, I would be wanting to fill those new tubs up, with like 325s. And that would require narrowing the rear anyway, or another set of custom wheels.
So it seems to me,that if you just get the springs outta the way,pull the rear end out,Get a set of off the shelf 10" wheels with a 4.5bs, and narrow the rear to fit those, then you will be all set for whatever wheels you like. The 4.5 used to be a very common bs.
BluNblue has stated many times that 275s fit back there. He did the homework for you. 275s are 10.8section on 8s. The 60s are 28 tall.I have had those 275/60-15s on 8.5s, in my stock Barracuda tubs. Miles of room.
I've put 10 inch 5.5bs wheels in there, and IMO it looks awful; but that is an opinion. I still have those wheels. But I paid a wheel company to move the centers in for a 4.5 bs, lol, after I narrowed the rear.Now they look OK,IMO.lol.